It is all rumors at that point but apparently Dutch GPS navigation system manufacturer TomTom is developing an add-on module for the iPhone. We’ve had many thoughts on getting GPS on iPhone and that one seems to be the closest as far as a real navigation system (unlike the GPS-free version through Navizon or Google Maps soon available on iPhone).

Further rumors propose that GPS module will be unveiled at MacWorld 2008 next month and the actual product

will have maps of the continental U.S. instead of Netherlands and will additionally work on an actual vehicle dashboard unlike a wooden table as seen in the slightly fake picture.

However, what makes that rumor slightly credible is that TomTom already offers the software to bring GPS navigation to PDA and other mobile devices (TomTom NAVIGATOR 6) and Apple may choose them by other types considering of their experience in the field… via

Original post by Tim Robbins